1 Trains collide: Two Union Pacific train crew members were killed and two were injured when two freight trains collided Sunday in Hoxie, Ark., authorities said. Union Pacific spokesman Brandon Morris said two cars caught fire, one carrying diesel and one carrying an alcoholic beverage. About 500 residents were temporarily evacuated while the fire was extinguished. An investigation into the cause of the collision is under way.

2Club shooting: Police searched Sunday for a gunman who opened fire at a busy nightclub in Salt Lake City, shooting six people. Hundreds of people fled the Inferno Cantina Night Club after shots rang out about 11:45 p.m. Saturday. None of the injuries was life threatening, police said. The gunman fled in a stolen Cadillac that was found about 5 miles away.

3 Zoo breach: A woman was cited after climbing into a giraffe exhibit at a zoo in Madison, Wis., and getting kicked in the face. Amanda Hall, 24, of San Luis Obispo, climbed over one fence and almost got over a second at the Henry Vilas Zoo on Saturday. A 12-foot-tall giraffe named Wally gave Hall a lick, then turned and kicked her in the face. Her injuries were not life-threatening. Police ticketed Hall for harassment of zoo animals, which carries a fine of $686. According to the police report, Hall told officers she climbed into the exhibit because she loves giraffes.

4 Rail deaths: A TriMet light-rail train serving residents in the Portland, Ore., region struck and killed two people in Gresham, one of whom was in a wheelchair, authorities said. A woman in a motorized mobility device exited the train Saturday with her developmentally disabled adult son, officials said. The man jumped on his mother's lap and hit the controls, propelling both of them into the gap between two train cars just as the train was leaving the station, officials said. The victims were identified as Bertha Kelly, 66, and John Paul Kelly, 48.

5 Working vacation: President Obama took a break in the middle of his Martha's Vineyard, Mass., vacation to return to Washington on Sunday night for meetings with advisers on the U.S. military campaign in Iraq and tensions between police and protesters in Ferguson, Mo. "I think it's fair to say there are, of course, ongoing complicated situations in the world, and that's why you've seen the president stay engaged," White House spokesman Eric Schultz said. Obama is to return to Martha's Vineyard on Tuesday.

6 Pool crash: An 85-year-old man was unharmed after he crashed his car into a backyard swimming pool in Altadena (Los Angeles County), authorities said. The man was pulling into his garage Saturday when the crash occurred. The car went through a rear garage door and into the pool, ending up fully submerged, officials said. The driver was able to get out of the car. He told authorities that his flip-flops became entangled with the pedals.